Image for a portion of a display screen



FIG. 1 is a front view of an icon for a portion of a display screen showing my new design; and,

FIG. 2 is another embodiment of an icon for a portion of a display screen showing my new design.

The broken line showing of the portion of the display screen in both views, and the images and text in FIG. 2 forms no part of the claimed design. 

The ornamental design for an image for a portion of a display screen, as shown and described. 